package org.mark.sell.config;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.loadbalancer.annotation.LoadBalancerClient;
import org.springframework.cloud.loadbalancer.core.RandomLoadBalancer;
import org.springframework.cloud.loadbalancer.core.ReactorLoadBalancer;
import org.springframework.cloud.loadbalancer.core.RoundRobinLoadBalancer;
import org.springframework.cloud.loadbalancer.core.ServiceInstanceListSupplier;
import org.springframework.cloud.loadbalancer.support.LoadBalancerClientFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.web.client.RestTemplate;

/**
 * @ClassName RestTemplateConfig
 */
@Configuration
@LoadBalancerClient(
        //下面的value值大小写一定要和consul里面的名字一样，必须一样
        value = "mark-storage", configuration = RestTemplateConfig.class)
public class RestTemplateConfig {

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }


    /**
     * 轮询负载均衡器，它会按顺序逐个选择服务实例，保证请求均匀地分配到各个实例上
     * @param environment
     * @param loadBalancerClientFactory
     * @return
     */
    @Bean
    ReactorLoadBalancer<ServiceInstance> roundRobinLoadBalancer(Environment environment,
                                                                LoadBalancerClientFactory loadBalancerClientFactory) {
        String name = environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);
        return new RoundRobinLoadBalancer(loadBalancerClientFactory.getLazyProvider(name, ServiceInstanceListSupplier.class), name);
    }

    /**
     * 随机负载均衡器，它会从所有可用的服务实例中随机的选择一个
     */
//    @Bean
//    ReactorLoadBalancer<ServiceInstance> randomLoadBalancer(Environment environment,
//                                                          LoadBalancerClientFactory loadBalancerClientFactory) {
//        String name = environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);
//        return new RandomLoadBalancer(loadBalancerClientFactory.getLazyProvider(name, ServiceInstanceListSupplier.class), name);
//    }
}
